Fortress of Louisbourg, Canada offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Fortress of Louisbourg, Nova Scotia, Canada, is known for the Fortress of Louisbourg National Historic Site. The best time to visit the Fortress of Louisbourg, Canada, is from June to September, with average air temperatures ranging from 15°C to 20°C (59°F to 68°F) and water temperatures around 10°C to 15°C (50°F to 59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!